diff --git a/django/forms/models.py b/django/forms/models.py
index d157c291ef..5edbbd376f 100644
--- a/django/forms/models.py
+++ b/django/forms/models.py
@@ -83,7 +83,7 @@ def model_to_dict(instance, fields=None, exclude=None):
     for f in chain(opts.concrete_fields, opts.private_fields, opts.many_to_many):
         if not getattr(f, 'editable', False):
             continue
-        if fields and f.name not in fields:
+        if fields is not None and f.name not in fields:
             continue
         if exclude and f.name in exclude:
             continue
